This digital converter converts IWV signals into DTMF signals, making it possible to connect old rotary dial telephones with pulse dialing - for example our W 48 - to modern telephone systems with multi-frequency dialing and routers (Speedport or FRITZ!Box). In this way, the old device is made ready for modern telephone networks and Internet telephony (VoIP), i.e. telephoning via computer networks set up according to Internet standards. The converter also has the following additional functions, which are controlled via the telephone dial: Last number redial, * and # buttons and 6 speed dial memories.